Dental tool for filling teeth with amalgam.



No. 674,761. P. J. FBIEDRICHS Patented May 2!, l90l.

DENTAL TOOL FOR FILLING TEETH WITH AMALGAM.

(Application flied Feb. 11 1901.)

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PHILIP JOHN FRIEDRICHS, OF NEW ORLEANS, LOUISIANA.

DENTAL TOOL FOR FILLING TEETH WITH AMALGAM.

SPECIFICATION forming part of Letters Patent N 0. 674,7 61, dated May 21, 1901. Application filed February 11, 1901. serial No. 46,876. lllo model.)

To all whom, it may concern.-

Be it known that I, PHILIP JOHN FRIED RICHS, a citizen of the United States, residing at the city of New Orleans, in the parish of Orleans, State of Louisiana, have invented a new and useful improvement in tools and implements for use in filling cavities in human.

teeth with amalgams or other compounds and cements used for that purpose in practical dentistry, of which the following is a specification, annexed drawings being made a part thereof.

My invention relates to the art of filling cavities in human teeth resulting from decay or other causes with amalgam or other cements inserted in such cavities while in a scmiplastic state and afterward becoming hard through chemical or molecular action sutficiently for the purpose of cavity-filling.

Cavities in teeth frequently occur in such parts of teeth or in teeth located in such situation in the mouth as to cause great difficulty in introducing such filling material in the cavity, causing much delay and loss of time in filling, frequently involving loss of the amalgam or cement sought to he used for the filling.

My in vention has for its purpose and object the overcoming of the above and other difficulties encountered in this branch of practical dentistry, and is effected by my invention of a dental tool or implement constructed and used and operated substantially as hereinafter described and indicated, reference being had to the annexed drawings as a part of this specification, and in which- Figure l is a perspective view of my improved tool. Fig. 2 is a rear view thereof without the handle. Fig. 3 is a front view thereof, showing a mass of amalgam or cement attached thereto. Fig. 4 is a transverse section on the lines 4 4, Fig. 2. Fig. 5 is a side elevation with a mass of amalgam or cement attached thereto before applying to a tooth. Fig. 6 is a side elevation showing the tool in operative position.

Referring to the drawings by referencenumerals, 1 denotes a thin but rigid plate or blade of metal or other suitable material of suitable length and width, having suflicient rigidity to adapt it to the use hereinafter described without too much deflection under pressure while in use. One end of this plate or blade is shaped into a tang or shank 1, to which may be attached a suitable permanently-secured handle 2, or, if preferred, it may be so constructed, shaped, and finished in the shank that it may be attached to and used with any form of socket-handle in use by dentists and removed therefrom when not in use.

Fig. 1 shows my invention with permanent handle, and Figs. 2 and 3 in form for use with removable socket-handle.

3 represents an elastic springplate attached to the plate orblade .l at or near the shank, as shown in the drawings, and may be so attached by or with rivets, as shown at 4 5, or with screws or in any other suitable manner, the other end of said spring being left free to deflect away from the lower side of the rigid plate 1, as shown in Fig. 6, when pressure or force is applied for that purpose, but while at rest and the instrument is not in use should be in contact with or in close proximity to the lower side of the rigid plate or blade 1. This spring-plate 3 is of such length and adjustment that it extends to near the outer end of the rigid plate or blade 1 and at its outer end is provided with two lugs or flanges 6 7, standing opposite to each other and at or nearly at right vertical angles with the upper plane surface of the spring-plate 3 and of vertical height sufficient when in position to extend sufficiently above the upper surface of the rigid plate 1 to assist or act in retaining the amalgam or cement material 8 while it is being introduced into the toothcavity and should be so constructed and adjusted in relation to each other and to the spring-plate 3 that when that plate is deflected back by pressure in the direction indicated in Fig. 6 the rigid plate 1 will pass freely between the lugs 6 7 and allow the spring-plate 3 to return to its normal position when deflecting pressure is removed.

Fig. 1 shows my invention attached to a permanent handle.

Figs. 2 and 3 show my invention with the tang or shank fitted for use with a detachable socket-handle.

The manner of using my invention will be readily understood by any practical dentist. An adequate mass of amalgam or other filling material 8 while in a plastic state is placed. upon the upper side or surface of the rigid plate or blade 1 between the flanges or lugs 6 7 in position, as plainly shown in Figs, 1 and 3, subjecting it to sufficient pressure to bear it down upon the plate or blade 1 and expand it laterally against the inside surface of the lugs or flanges 6 7 with sufficient force to cause the material for filling to be held in position while in transit to the tooth-cavity.

The filling material is then by the use of the instrument transported to the tooth-cavity to be filled, the instrument being placed in such position against the tooth that the lugs or flanges 6 7 will comein contact with the tooth at their outer ends, one of the lugs being on each side of the cavity to be filled, or, in other words, straddle the cavity. When the instrument is in that position, it is pressed forward in the direction of the tooth or cavity to be filled, causing the spring-plate 3 to deflect backward,withdrawingits lugs or flanges 6 7, releasing the filling material, while by the forward action of the rigid plate the mass of filling material is forced into the cavity. The lugs or flanges 6 7 while in position against the tooth and while being withdrawn by pressure, it will be seen, act as guides to direct the amalgam or filling material into the cavity and measurably prevent its lateral expansion in that direction while being thrust into the cavity by the rigid plate or blade 1 and made ready for further packing and manipulation.

It will be obvious to any practical dentist that by holding the spring-plate 3 so as to prevent deflection my invention can be used to pick up amalgam or filling-cements from the table or place of preparation.

I claim as new and desire to secure by Letters Patent A tool oramalgam and cement carrier, consisting of a plate or blade having a shank or tang combined with a spring-plate provided With lugs or flanges substantially as and for the purposes specified. y

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

PHILIP JOHN FRIEDRIOHS.

Witnesses:

WM. ZACHRINGER, A. BASSETT. 

